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Electrical Standart

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electrical standart symbols and aplication

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									International Standards
International Standards Agencies                                                     1st    Protection from
Argentina      Germany                     Mexico             South Africa          Digit   Solid Objects
                                                                                     0      No Protection
Australia      Hungary                     Netherlands        Spain
                                                                                     1      Protected against solid objects
Austria        India                       New Zealand        Sweden                        greater than 50 mm

Belgium        Indonesia                   Norway             Switzerland
                                                                                     2      Protected against solid objects
Canada         Iran                        Pakistan           United Kingdom
                                                                                            greater than 12 mm
                                                                                                                              Z
Denmark        Ireland                     Poland                                           Protected against solid objects
                                                              United States          3      greater than 2.5 mm
Egypt          Israel                      Portugal
                                                                       ®
Finland        Italy                       Romania            Venezuela                     Protected against solid objects
                                                                                     4      greater than 1.0 mm
France         Japan                       Singapore          Yugoslavia

                                                                                     5      Dust Protected
International Power Plugs                   IP Codes
and Sockets                                 (Ingress Protection)
Continental                                IEC 529 outlines an international
Europe                                     classification system for the sealing     6      Dust Tight
                                           effectiveness of enclosures of
                                           electrical equipment against the
Europlug                                   intrusion into the equipment of
(ungrounded)                               foreign bodies (i.e., tools, dust,
                                           fingers) and moisture. This              2nd     Protection from
Australia
                                           classification system utilises the       Digit   Moisture
                                           letters ‘IP’ (Ingress Protection)
                                           followed by two digits. An ‘X’ is used    0      No Protection
Australia                                  for one of the digits if there is only
(ungrounded)                               one class of protection; i.e., IPX4,      1      Protected against vertically
                                           which addressed moisture                         dripping water
                                           resistance only.
United
Kingdom                                    Degrees of Protection –
                                           First Digit                               2      Protected against
                                           The first digit of the IP code                   dripping water when
Denmark                                                                                     tilted up to 15°
                                           indicates the degree that persons
                                           are protected against contact with
France
                                           moving parts (other than rotating         3      Protected against
                                           shafts, etc.) and the degree that                spraying water @ up to
                                           equipment is protected against solid             60° from vertical
India                                      bodies intruding into a enclosure.

                                           Degrees of Protection –                   4      Protected against
                                           Second Digit                                     splashing water
Israel                                                                                      from all directions
                                           The second digit indicates the
                                           degree of protection of the
Italy                                      equipment inside the enclosure            5      Protected against
                                           against the harmful entry of various             water jets
                                           forms of moisture (e.g., dripping,
Japan                                      spraying, submersion, etc.).
                                                                                     6      Protected against
                                                                                            heavy seas & streaming
                                                                                            water
North
America                                                                              7      Protected against
                                                                                            effects of short-term
                                                                                            immersion

Switzerland
                                                                                     8      Protected against
                              5
                                           Reproduced with permission of Panel              submersion
                                           Components Corp.
IEC 906-1              18.5

                                       3
                                  19




                                                                      Z-194
Standards
NEMA, UL and CSA Ratings                                  NEMA, UL and CSA Ratings
What’s in a rating?                                                                                                       North American enclosure ratings systems
As a way of standardizing enclosure                       NEMA, UL and CSA are standard-writing                           also include a 4X rating that indicates
performance, organizations like NEMA, UL,                 organizations commonly recognized in North                      resistance to corrosion. This rating is based
CSA, IEC, VDE and TUV use rating systems                  America. Their ratings are based on similar                     on the enclosure’s ability to withstand
                                                          application descriptions and expected                           prolonged exposure to salt water spray.
to identify an enclosure’s ability to resist
external environmental influences.                        performance. UL and CSA both require                            While a 4X rating is a good indicator that an
                                                          enclosure testing by qualified evaluators. They                 enclosure can resist corrosion, it does not
Resistance to everything from dripping liquid                                                                             provide information on how a specific
to hose-down to total submersion is defined               also send site inspectors to make sure a
                                                                                                                          corrosive agent will affect a given enclosure
by the ratings systems. While these ratings               manufacturer adheres to prescribed                              material. It is best to conduct a full analysis of
systems are all intended to provide                       manufacturing methods and material                              the specific application and environment to
information to help you make a safer, more                specifications. NEMA, on the other hand, does                   determine the best enclosure choice.
informed product choice, there are                        not require independent testing and leaves
differences among them.                                   compliance completely up to the manufacturer.
Exposure type non-hazardous location
                                 National Electrical                                       Underwriters                                          Canadian
                   NEMA          Manufacturers                                             Laboratories Inc.                                     Standards
                                 Association                                               (UL 50 and UL508)                                     Association
                                 (NEMA Standard 250)                            ®
                                                                                                                                                 (Standard C22.2 No.94)
                                 and Electrical and
                                 Electronic Mfg.
  Enclosure                      Association of                             LISTED
  Rating                         Canada (EEMAC)
                  Enclosures are intended for indoor                    Indoor use primarily to provide                          General purpose enclosure.
                  use primarily to provide a degree of                  protection against contact with                          Protects against accidental contact
  Type 1          protection against contact with the                   the enclosed equipment and                               with live parts.
                  enclosed equipment or locations where                 against a limited amount of
                  unusual service conditions do not exist               falling dirt.
                  Enclosures are intended for indoor                    Indoor use to provide a degree                           Indoor use to provide a degree
                  use primarily to provide a degree of                  of protection against limited                            of protection against dripping and
  Type 2          protection against limited amounts                    amounts of falling water and                             light splashing of non-corrosive
                  of falling water and dirt.                            dirt.                                                    liquids and falling dirt.
                  Enclosures are intended for                           Outdoor use to provide a                                 Indoor or outdoor use; provides
                  outdoor use primarily to provide                      degree of protection against                             a degree of protection against
  Type 3          a degree of protection against                        windblown dust and windblown                             rain, snow, and windblown dust;
                  windblown dust, rain and sleet;                       rain; undamaged by the                                   undamaged by the external
                  undamaged by the formation                            formation of ice on the                                  formation of ice on the enclosure.
                  of ice on the enclosure.                              enclosure.
                  Enclosures are intended for outdoor                   Outdoor use to provide a                                 Indoor or outdoor use; provides
                  use primarily to provide a degree of                  degree of protection against                             a degree of protection against
  Type 3R         protection against falling rain and                   falling rain; undamaged by the                           rain and snow; undamaged by the
                  sleet; undamaged by the formation                     formation of ice on the                                  external formation of ice on the
                  of ice on the enclosure.                              enclosure.                                               enclosure.
                  Enclosures are intended for                           Either indoor or outdoor use to                          Indoor or outdoor use; provides
                  indoor or outdoor use primarily                       provide a degree of protection                           a degree of protection against
                  to provide a degree of protection                     against falling rain, splashing                          rain, snow, windblown dust,
  Type 4          against windblown dust and rain.                      water, and hose-directed water;                          splashing and hose-directed water;
                  splashing water, and hose-                            undamaged by the formation                               undamaged by the external formation
                  directed water; undamaged by                          of ice on the enclosure.                                 of ice on the enclosure.
                  the formation of ice on the enclosure.
                  Enclosures are intended for indoor                    Either indoor or outdoor use to                          Indoor or outdoor use; provides
                  or outdoor use primarily to provide                   provide a degree of protection                           a degree of protection against
                  a degree of protection against                        against falling rain, splashing                          rain, snow, windblown dust,
                  corrosion,windblown dust and                          water, and hose-directed water;                          splashing and hose-directed water;
  Type 4X         rain, splashing water, and hose-                      undamaged by the formation                               undamaged by the external formation
                  directed water; undamaged by the                      of ice on the enclosure;                                 of ice on the enclosure; resists corrosion.
                  formation of ice on the enclosure.                    resists corrosion.
                  Enclosures are intended for                           Indoor or outdoor use to provide                         Indoor or outdoor use; provides
                  use indoors or outdoors where                         a degree of protection against                           a degree of protection against
  Type 6          occasional submersion is                              entry of water during temporary                          the entry of water during temporary
                  encountered; limited depth;                           submersion at a limited depth;                           submersion.
                  undamaged by the formation of ice                     undamaged by the formation of
                  on the enclosure; resists corrosion.                  ice on the enclosure.
                  Enclosures are intended for                           Indoor use to provide a degree of                        Indoor use; provides a degree of
                  indoor use primarily to provide                       protection against dust, dirt, fiber                     protection against circulating dust, lint,
  Type 12         a degree of protection against                        flyings, dripping water, and                             fibers and flyings; dripping and light
                  dust, falling dirt, and dripping                      external condensation of                                 splashing of non-corrosive liquids; not
                  non-corrosive liquids.                                non-corrosive liquids.                                   provided with knockouts.
                  Enclosures are intended for                           Indoor use to provide a degree of                        Indoor use; provides a degree of
                  indoor use primarily to provide                       protection against lint, dust seepage,                   protection against circulating dust, lint,
  Type 13         a degree of protection against                        external condensation and spraying of                    fibers and flyings, seepage and spraying of
                  dust, spraying of water, oil, and                     water, oil, and non-corrosive liquids.                   non-corrosive liquids, including oils and
                  non-corrosive coolant.                                                                                         coolants.
                This material is reproduced with permission            This material is reproduced with permission from        This material is reproduced with permission from
                from NEMA. The preceding descriptions,                 Underwriters Laboratories Inc. Enclosures for           Canadian Standards Association.
                however, are not intended to be complete               Electrical Equipment, UL 50.Copyright 1995;
                representations of National Electrical                 and Industrial Control Equipment, 508, Copyright
                Manufacturers Association standards for                1996 by Underwriters Laboratories, Inc.
                enclosures nor those of the Electrical and
                Electronic Manufacturers Association of                Underwriters Laboratories Inc.(UL) shall not be
                Canada                                                 responsible for the use of or reliance upon a UL
                                                                       Standard by anyone. UL shall not incur any
                                                                       obligation or liability for damages, including
                                                                       consequential damages, arising out of or in
                                                                       connection with, interpretation of, or reliance
                                                                       upon a UL Standard.
                                                                               Z-195
Standards
CE and IEC Classifications
CE                                               Applicable European Directives                    not test for environmental conditions
The CE Mark is a European Union (EU)             73/23/EEC Low Voltage Directive for               such as corrosion, rust, icing, oil, and
compliance symbol and acronym for                Electrical Equipment within Certain               coolants. For this reason, and because
Conformité Européenne. The CE Mark               Voltage Limits                                    the tests and evaluations for other
indicates that a product complies with all                                                         characteristics are not identical, the IEC
European directives and essential                89/336/EEC EMC Directive Relating to              enclosure classification designations
Harmonized Standards for health, safety,         Electromagnetic Compatibility                     cannot be exactly equated with NEMA
                   environment, and
                   consumer protection
                                                 Note: The EMC Directive is only
                                                                                                   enclosure Type numbers.
                                                                                                                                                     Z
                                                 secondarily applicable since an empty             The table on below provides a cross-
                   that may apply to that        enclosure does not produce                        reference from NEMA enclosure Type
                   product. In addition,         electromagnetic interference.                     numbers to IEC enclosure classification
                   the CE Mark promotes                                                            designations. This cross-reference is a
                   free trade movement           Applicable European Standards                     Hoffman approximation based on the
                   from outside and within       EN60529-1 (IEC529-1) Degrees of                   most current available information on
                   the EU.                       Protection Provided by Enclosures                 enclosure test performance and is not
For industrial control equipment, the CE                                                           sanctioned by NEMA, IEC, VDE, or any
                                                 EN60204-1 (IEC204-1) Electrical                   affiliated agency.
Mark is not intended to be applied to            Equipment of Industrial Machines
empty enclosures because such                                                                      To use the table, first find the
enclosures are inactive components of a                                                            appropriate NEMA rating along the
final assembly. The responsibility for                                                             vertical axis and then read across the
insuring compliance to all applicable EU         International Standards’ IP                       horizontal axis for the corresponding IP
Directives and Harmonized Standards              Protection Classification                         rating. Do not use this table to convert
belongs with the final equipment                 IEC Publication 529, Classification of            IEC classification designations to NEMA
manufacturer.                                    Degrees of Protection by Enclosures,              Type numbers.
                                                 provides a system for specifying
Hoffman enclosures are designed in               enclosures of electrical equipment on
compliance with European standards               the basis of the degree of protection
and are eligible to receive a                                      required. IEC 529 does
Manufacturer’s Declaration of                                      not specify degrees of
Conformity. The certificate assists the                            protection against risk
final equipment manufacturer in                                    of explosions or
obtaining the CE Mark. Contact                                     conditions such as
Applications Engineering at (612) 422-                             moisture (produced, for
2868 for further information.                                      example, by
Hoffman enclosures meet the                                        condensation),
requirements of the applicable                   corrosive vapors, fungus, or vermin.
European standards specified below.              NEMA Standards Publication 250 does

In Europe, IEC ratings are based on performance criteria similar to NEMA. Nevertheless, there are differences in how enclosure performance is
interpreted. For example, UL and CSA test requirements specify that an enclosure fails the watertight test if even a single drop of water enters
the enclosure. In the IEC standards for each protection level (IP), a certain amount of water is allowed to enter the enclosure. IEC does not
specify degrees of protection against risk of explosions or conditions such as moisture or corrosive vapors. NEMA, on the other hand, does
specify for most environmental conditions. For this reason, and because the tests and evaluations for other characteristics are not identical, the
IEC enclosure classification designations cannot be exactly equated with NEMA enclosure Type numbers.


Cross Reference (Approximate) NEMA, UL, CSA, vs. IEC Enclosure Type
(Cannot be used to convert IEC Classifications to NEMA Type numbers)

 Enclosure
 Rating                IP23            IP30             IP32             IP55             IP64          IP65          IP66           IP67
 Type 1                  •
 Type 2                                   •
 Type 3                                                                                     •
 Type 3R                                                   •
 Type 3S                                                                                    •
 Type 4                                                                                                                  •
 Type 4X                                                                                                                 •
 Type 6                                                                                                                                •
 Type 12                                                                    •
 Type 13                                                                                                   •
 IEC 529 has no equivalents to NEMA enclosure Types 7, 8, 9, 10, or 11.
•Indicates compliance
                                                                     Z-196
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